[tex]\bf \begin{array}{ccll}
\stackrel{mg}{medicine}&\stackrel{kg}{weight}\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
6.5&1\\
x&50
\end{array}\implies \cfrac{6.5}{x}=\cfrac{1}{50}\implies \cfrac{6.5\cdot 50}{1}=x\implies 325=x[/tex]
